Grossies is used as an expression for when something is distasteful, not your thing, when you feel an ick or when you just don't like something. Similar to the word disgusting but more of an expression.
"Ew that's grossies, how could you let him do that to you" or "that's grossies man" "uhhh, GROSSIES!"
Lady Isabella bid me invite. “Lambkin, put down thy grossmesser and crease my gown” she said softly. “I believe you err, me lady. Thou yearnth me blade. Thou have it!” said I. We banged so hard the UPS guy heard us.